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Validation of annulus formation and growth estimation of South Atlantic swordfish

Published online by Cambridge University Press:  29 June 2016

Alexandra Garcia*
Affiliation:
IPMA, Portuguese Institute for the Ocean and Atmosphere, Avenida 5 de Outubro s/n, 8700-305 Olhão, Portugal
George Tserpes
Affiliation:
HCMR, Institute of Marine Biology of Crete, P.O. Box 2214, 71003 Iraklion, Greece
Miguel Neves Santos
Affiliation:
IPMA, Portuguese Institute for the Ocean and Atmosphere, Avenida 5 de Outubro s/n, 8700-305 Olhão, Portugal International Commission for the Conservation of Atlantic Tuna (ICCAT), Calle Corazon de Maria6, 6-7, 28002 Madrid, Spain
*
Correspondence should be addressed to: A. Garcia, IPMA, Portuguese Institute for the Ocean and Atmosphere, Avenida 5 de Outubro s/n, 8700-305 Olhão, Portugal email: alexandra.garcia.guerreiro@gmail.com

Abstract

Swordfish (Xiphias gladius) is heavily exploited in the Atlantic Ocean by several European fleets and age and growth studies are essential for the accomplishment of the stock assessments carried out by ICCAT. The present study aims to validate the periodicity of growth increments on swordfish fin spines and provide first estimates of the growth parameters of South Atlantic swordfish. A total of 502 (231 males and 271 females) spine samples were collected from swordfish specimens onboard commercial longline vessels, from 2006 to 2009. Estimated ages ranged between 0 and 12 years, with age groups 3 and 4 dominating the samples. Marginal increment analysis suggested that growth bands were deposited annually in mid-spring. Fitted standard von Bertalanffy growth parameters (sexes combined) were L = 317.133, k = 0.085 and t 0 = −2.488. Minor, but insignificant, growth differences were observed between sexes.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

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